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Vitreous enamel - Europeana Collections
Vitreous enamel, also porcelain enamel in US English, is a material made by fusing powdered glass to a substrate by firing, usually between 750 and 850 °C (1,380 and 1,560 °F). The powder melts, flows, and then hardens to a smooth, durable vitreous coating on metal, or on glass or ceramics. The term "enamel" is most often restricted to work on...